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The recent trend toward the compact and light-weight construction of diesel engines with high power output has been imposing higher requirements of fatigue strength and antiseizure characteristics on bearings. In order to meet these requirements, the authors developed a new bearing alloy of higher fatigue strength for use in heavy load engines, through the analysis of the Al-Zn-Si alloy which has high corrosion resistance. Experimental results of this new alloy to study its physical properties and bearing performances indicate that it can be applied to bearings in diesel engines which operate in harsh conditions.

The recent trend toward the compact and light-weight construction of automotive engines with high power output has been imposing higher requirements of fatigue strength, anti-seizure property and conformability on bearings. In order to meet these requirements, the authors analyzed the property of each layer of multi-layer Al-Si-Sn bearings and investigated its influence on bearing performance. Improvement was achieved as to the bearing alloy and the intermediate bonding layer based on the results of the investigation. As a result, this newly improved bearing has been concluded to provide better fatigue strength than conventional bearings. It has thus become possible to apply it as a bearing for the recent engines used under harsh conditions.

The advent of high-performance, compact, and lightweight engines in recent years brings forth a tendency to increase the load for engine bearings and demands on producing even higher levels of durability and reliability in bearing products against fatigue, seizure, wear, and corrosion. Based on the perspective of extending the bearing life, the authors have studied the problems that are encountered with the current three layer copper-lead alloy bearings after their overlay has worn out. Then, we studied the issues of lowered seizure resistance that results from the exposure of the nickel barrier, and of deficient corrosion resistance that results from the exposure of the bearing alloy. In order to improve upon these areas, we focused on diffusion phenomenon of overlay elements without the nickel barrier and also studied the feasibility of creating engine bearings whose alloy composition has been partially modified.